NutriCology Zinc Citrate allows you to add a highly bioavailable form of zinc to your supplement regimen. Zinc is a trace mineral that is important for healthy functioning of all organs. It is essential for more than 30 enzyme reactions that feed into a variety of homeostatic functions. Zinc is located at the active site of superoxide dismutase (SOD), a major protective antioxidant enzyme, and zinc-dependent enzymes are involved in growth, immunity and tissue renewal.